The first round of voting takes place on Sunday. If no single candidate gets more than 50 percent of the vote, which seems the most likely, then a second run-off election between the top two candidates will occur on May 7.

Polling suggests the two candidates who will make it to round two are Macron, a centrist who is pro-European Union; and right-wing leader Marine Le Pen, who would likely push for a "Frexit." Macron seems to have the advantage in the second round.

In the statement, Lewis said Obama "remains deeply committed" to France to as a close ally of the U.S., and "as a leader on behalf of liberal values in Europe and around the world."